Safe To Replace Original HDrive with Cloned Backup? OS X 4.11

Hi,
I recently encountered problems with loads of my Preferences settings going missing (posted a thread here
https://discussions.apple.com/message/22128817#22128817   )
But a thought occurred to me: I have a perfect CCCloned Backup Drive of my original HD that I did 6 weeks back.
Can I use this to overwrite the existing Hard Drive - i.e. make the Clone the internal drive?
I'd imagine first I'll need to bootup from the Cloned disk. Then, I could choose the internal HD as the destination.
If so, I guess I will I need to format the original HD and what pitfalls should I watch out for? Am I going to do more harm than good?
Note: I thought of simply finding my old .plist preference files on the Cloned drive and replacing the original, so as to get the system back to the way it was before preference-wise - but oddly the .plists for mac/mail.plist etc weren't on the Cloned drive. For a layman like me that seems strange.
Thanks,
Adrian

You can hold the option/alt key down on a wired or built in keyboard and boot from the clone drive, grab the latest copies of your files and reverse clone your troubles away (currently doing that right now and typing here too. )
All your software and OS X will have to be updated of course.
You can find the
com.apple.mail.plist
file in the User/Library (hidden in 10.7 and up)
However since it's just a preferences file for Mail, you can delete it and reboot the machine and launch Mail, a new preferences file is automatically created with no preferences of course.
Deleting the System Preference or other .plist file
https://discussions.apple.com/community/notebooks/macbook_pro?view=documents#/?p er_page=50
If you do plan on reverse cloning, do take the extra step first to use Disk Uilitiy to Zero Erase the Macinstosh HD partition (if on 10.7 or above) or the entire drive (10.6 no BootCamp) as to catch any potential failing sectors.
10.7+ you need to move the slider one space to the right, do not do anymore as it's not necessary and takes a really long time.
10.6 you use Security Option > Zero and then click erase.

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